Some time ago I have found iscan plugin ebuild for Epson Perfection V10\V100 (GT-S600) somewhere in the internet. Its version was 2.1.0. After upgrading of hardware (MB, CPU etc) my scanner began to scan with colour horizontal stripes on images. I've found that it's corrected in version 2.1.2 of iscan plugin. So I've updated ebuild to install 2.1.2 version.
I don't know where such ebuilds should come (I'm not sure that I want maintain it), but I think it will be usefull for somebody. So here it is:

iscan-plugin-gt-s600-2.1.2.ebuild:

Code:

# Copyright 1999-2009 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

I can confirm the ebuild works perfectly. Thank you very much, this is greatly appreciated.

If anyone wants to use it I recommend setting a local portage overlay with layman and copy the ebuild in your own media-gfx/iscan-plugin-gt-s600 path. The URLs in the ebuild for the rpm(s) may change by the time you read this message, but that shouldn't be too hard to adjust.